Water → Urea, N,N-dimethyl-N(sup 1)-(5-(2-fluorophenyl)-2,3-dihydro-1-methyl-2-oxo-1H-1,4-benzodiazepin-7-yl)-

Participants

Reaction Conditions

Reaction Steps

4.2 g (0.015 M) of 7-amino-5-(o-fluorophenyl)-1,3-dihydro-1-methyl-2H-1,4-benzodiazepin-2-one are suspended in 60 ml of absolute methylene chloride, treated with 2.1 g of powdered potassium carbonate and 1.6 ml of dimethylcarbamoyl chloride and stirred at 20° C. for 14 days. The mixture is then poured on to a mixture of ice and water, extracted with methylene chloride and the organic phase is washed 2-3 times with water, dried with sodium sulphate, filtered and concentrated. The residue is purified on a 200 g silica gel column using ethyl acetate as the eluting agent and crystallised from ethanol/petroleum ether. There is obtained 3-[5-(o-fluorophenyl)-2,3-dihydro-1-methyl-2-oxo-1H-1,4-benzodiazepin-7-yl]-1,1-dimethylurea which crystallises with 0.5 mol of ethanol and melts at 97° C. with decomposition.

Provenance & Evidence